基于欧拉—拉格朗日模型的单相有源电力滤波器无源性控制新方法  

A Novel Passivity-Based Control Algorithm for Single-Phase Active Power Filter Using Euler-Lagrange Model

作　　者：张振环[1] 刘会金[1] 李琼林[1] 张全明[1] 

机构地区：[1]武汉大学电气工程学院,湖北省武汉市430072

出　　处：《中国电机工程学报》2008年第9期37-44,共8页Proceedings of the CSEE

基　　金：国家自然科学基金项目(50677045)~~

摘　　要：有源电力滤波器(active power filter,APF)的控制方法是决定其补偿性能的关键因素之一。该文基于单相APF的Euler-Lagrange(EL)系统状态平均模型,提出了一种无源性控制新方法。该方法首先基于替代定理建立了考虑源阻抗和非线性负荷影响的单相APFEL系统状态平均模型,在此基础上设计了无源性间接控制律,确保对单相APF控制目标的渐近跟踪。由于在线计算直流电容指令电压波动量十分困难,在控制方法的执行中忽略波动量的影响,简化了控制方法的实现;此外,该方法还研究了所注入的阻尼大小对控制效果的影响以及APF内层控制过调制产生的原因,针对无源性控制律跟踪精度的要求与内层控制过调制限幅条件间的矛盾,通过构造模糊逻辑推理环节实现阻尼系数的在线调整,在满足内层控制限幅条件下确保跟踪精度和补偿效果。仿真结果验证了所提出方法的正确性和有效性。The performance and application of active power filter（APF） in power system is closely linked to the selection of control strategies. The paper proposes a novel passivity-based algorithm for single-phase APF based on its Euler-Lagrange（EL） averaged model. Firstly, the EL averaged model of single-phase APF with the presence of feeder impedance and nonlinear loads is established in terms of substitution theorem. Then, according to passivity theory and EL averaged model, the passivity-based indirect control law is acquired so that asymptotically tracking control objectives are achieved. In order to overcome the difficulty in estimating the ripple component on dc-side capacitor reference voltage, the modified control algorithm is proposed by ignoring the ripple component. Furthermore, the relation between control performance and damping coefficient is researched. In addition, the reasons of voltage source converter（VSC） inner-loop control overmodulation are also analyzed. Based on the relation between control performance and VSC inner-loop input saturation, damping coefficient is adjusted on-line by fuzzy logic reasoning so that the trade-off between control accuracy and limitation of VSC inner-loop control overmodulation is solved preferably. Lastly, simulation results are presented to verify the validity of the proposed control algorithm.

关 键 词：单相有源电力滤波器 无源性 欧拉-拉格朗日系 统平均模型 反馈控制 模糊逻辑推理 

分 类 号：TM761[电气工程—电力系统及自动化]